Modification of the turbulent energy cascade by polymer additives

Details Modification of the turbulent energy cascade by polymer additives Modification of the turbulent energy cascade by polymer additives

2007-08-29

arxiv.org/abs/0708.3945v2

Physics

Fluid Dynamics

4 pages, 3 figures, changed content

Scientific paper

By tracking small particles in the bulk of an intensely turbulent flow, we show that even a very small concentration of long-chain polymers disrupts the usual turbulent energy cascade. The polymers affect scales much larger than their physical size, from the dissipation range to the inertial range. The effect depends strongly on the polymer concentration. While the dissipative-scale statistics change continuously as the polymer concentration is increased, the inertial-range energy transfer rate is only altered by the polymer additives when the concentration is above a threshold (approximately 5 parts per million by weight for the polymer we used).

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